ORA-07445: exception encountered: core dump [kkoipt()+3881] [SIGSEGV] [Address not mapped to object] [0x000000028] [] []

[root@ora udump]# more orclsid_ora_13842.trc
/data/oracle/admin/orclsid/udump/orclsid_ora_13842.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /data/oracle/product/10.2.0.1
System name:    Linux
Node name:      ora.orclsid.com.cn
Release:        2.6.18-194.32.1.el5
Version:        #1 SMP Wed Jan 5 17:52:25 EST 2011
Machine:        x86_64
Instance name: orclsid
Redo thread mounted by this instance: 1
Oracle process number: 28
Unix process pid: 13842, image: oracle@ora.orclsid.com.cn

*** 2011-02-15 14:40:28.387
*** ACTION NAME:() 2011-02-15 14:40:28.386
*** MODULE NAME:(JDBC Thin Client) 2011-02-15 14:40:28.386
*** SERVICE NAME:(SYS$USERS) 2011-02-15 14:40:28.386
*** SESSION ID:(537.2724) 2011-02-15 14:40:28.386
Exception signal: 11 (SIGSEGV), code: 1 (Address not mapped to object), addr: 0x
28, PC: [0x3028817, kkoipt()+3881]
*** 2011-02-15 14:40:28.394
ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump [kkoipt()+3881] [SIGSEGV] [Address n
ot mapped to object] [0x000000028] [] []
Current SQL statement for this session:
SELECT * FROM (SELECT ROWNUM PAGE_RN, PAGE_A.* FROM( SELECT                    
                        MB.tab1_AUTOID                                ,MC.VA
LUE                                         ,MB.tab1_TIMESTAMP             
              ,MB.tab1_SUBJECT                              ,MB.tab1_URL
                                  ,MB.tab1_URL_ENABLED                     
    ,SUM(1) OVER() TOTALCOUNT                             FROM                 
                            ora_tab1 MB                                   ,(
 SELECT SUBCLASS, VALUE FROM ora_tab            WHERE  MAINCLASS = 'MENU' ) M
C                 WHERE                                             MB.tab1_
ENABLED = 1                           AND  MC.SUBCLASS (+)=  MB.tab1_CLASS 
        ORDER BY MB.tab1_AUTOID DESC                ) PAGE_A WHERE ROWNUM <=
 20) PAGE_B WHERE PAGE_B.PAGE_RN>0
----- Call Stack Trace -----
calling              call     entry                argument values in hex     
location             type     point                (? means dubious value)    
-------------------- -------- -------------------- ----------------------------
ssd_unwind_bp: unhandled instruction at 0x2fb3962 instr=f
ksedst()+31          call     ksedst1()            000000000 ? 000000001 ?
                                                   2AFAF78DFD50 ? 2AFAF78DFDB0 ?
                                                   2AFAF78DFCF0 ? 000000000 ?
[root@ora udump]# more /data/oracle/admin/orclsid/udump/orclsid_ora_15483.trc
/data/oracle/admin/orclsid/udump/orclsid_ora_15483.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /data/oracle/product/10.2.0.1
System name:    Linux
Node name:      ora.orclsid.com.cn
Release:        2.6.18-194.32.1.el5
Version:        #1 SMP Wed Jan 5 17:52:25 EST 2011
Machine:        x86_64
Instance name: orclsid
Redo thread mounted by this instance: 1
Oracle process number: 19
Unix process pid: 15483, image: oracle@ora.orclsid.com.cn (TNS V1-V3)

*** 2011-02-15 14:46:02.648
*** ACTION NAME:() 2011-02-15 14:46:02.647
*** MODULE NAME:(SQL*Plus) 2011-02-15 14:46:02.647
*** SERVICE NAME:(SYS$USERS) 2011-02-15 14:46:02.647
*** SESSION ID:(517.2366) 2011-02-15 14:46:02.647
Exception signal: 11 (SIGSEGV), code: 1 (Address not mapped to object), addr: 0x28, PC: [0x3028817, kkoipt()+3881]
*** 2011-02-15 14:46:02.655
ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump [kkoipt()+3881] [SIGSEGV] [Address not mapped to object] [0x000000028] [] []
Current SQL statement for this session:
SELECT *
  FROM (SELECT ROWNUM PAGE_RN, PAGE_A.*
          FROM (SELECT MB.tab1_AUTOID,
                       MC.VALUE,
                       MB.tab1_TIMESTAMP,
                       MB.tab1_SUBJECT,
                       MB.tab1_URL,
                       MB.tab1_URL_ENABLED,
                       SUM(1) OVER() TOTALCOUNT
                  FROM ora_tab1 MB,
                       (SELECT SUBCLASS, VALUE
                          FROM ora_tab
                         WHERE MAINCLASS = 'MENU') MC
                 WHERE MB.tab1_ENABLED = 1
                   AND MC.SUBCLASS(+) = MB.tab1_CLASS
                 ORDER BY MB.tab1_AUTOID DESC) PAGE_A
         WHERE ROWNUM <= 20) PAGE_B
 WHERE pAGE_B.PAGE_RN > 0
----- Call Stack Trace -----
calling              call     entry                argument values in hex     
location             type     point                (? means dubious value)    
-------------------- -------- -------------------- ----------------------------
ssd_unwind_bp: unhandled instruction at 0x2fb3962 instr=f
ksedst()+31          call     ksedst1()            000000000 ? 000000001 ?
                                                   2B9F9FAC6D50 ? 2B9F9FAC6DB0 ?
                                                   2B9F9FAC6CF0 ? 000000000 ?
ksedmp()+610         call     ksedst()             000000000 ? 000000001 ?
                                                   2B9F9FAC6D50 ? 2B9F9FAC6DB0 ?
                                                   2B9F9FAC6CF0 ? 000000000 ?
ssexhd()+629         call     ksedmp()             000000003 ? 000000001 ?
                                                   2B9F9FAC6D50 ? 2B9F9FAC6DB0 ?
                                                   2B9F9FAC6CF0 ? 000000000 ?
__restore_rt()+0     call     ssexhd()             00000000B ? 2B9F9FAC7D70 ?
                                                   2B9F9FAC7C40 ? 2B9F9FAC6DB0 ?
                                                   2B9F9FAC6CF0 ? 000000000 ?
kkoipt()+3881        signal   __restore_rt()       000000000 ? 000000000 ?
                                                   000000232 ? 000000000 ?
                                                   2B9F9FD0CFE8 ? 2B9F9FD87F38 ?
kkoqbc()+3552        call     kkoipt()             2B9F9FDACA98 ? 000000000 ?
                                                   000000002 ? 000000000 ?
                                                   7FFF00000001 ? 2B9F9FD80000 ?
apakkoqb()+167       call     kkoqbc()             000000000 ? 2B9F9FD0DE28 ?
                                                   000000002 ? 000000000 ?
                                                   000000001 ? 000000001 ?
apaqbdDescendents()  call     apakkoqb()           7FFF0C4D8350 ? 2B9F9FD0DE28 ?
+414                                               1F2621D20 ? 000000000 ?
                                                   000000001 ? 000000001 ?
apaqbdListReverse()  call     apaqbdDescendents()  7FFF0C4D8350 ? 2B9F9FD0DE28 ?
+68                                                1F2621D20 ? 000000000 ?
                                                   000000001 ? 000000001 ?
apaqbdDescendents()  call     apaqbdListReverse()  7FFF0C4D8350 ? 2B9F9FD0DE28 ?
+226                                               1F2621D20 ? 000000000 ?
                                                   000000001 ? 000000001 ?
apaqbdListReverse()  call     apaqbdDescendents()  7FFF0C4D8350 ? 2B9F9FD0F2D0 ?
+68                                                1F2621D20 ? 000000000 ?
                                                   000000001 ? 000000001 ?

-----------------

oracle 官方给了个不一定能解决问题的方法
修改隐含参数

默认值是true，改成false，无效
alter system set "_complex_view_merging"=true;

之后分析sql，分段执行，当去掉ROWNUM <= 20时语句正常
rownum<=6,5,4,3,2,1都可以，再更大报错

检查表ora_tab1
发现多个字段重复创建联合索引
由于表数据量较小，将索引全部删除后系统恢复正常